Piston packing-ring.



R.L.BURD.

PISTON PACKING RING.

' APPLICATION FILED my 6, 1913..

1,092,201, Patented Apr. 7, 1914 V larly for use in mice is to be had toTo all whom it may concern EOY L. BURD, OF CHICAGO, ILLINOIS.

rrsron 'PACKINQBING.

Specification of Letters Patent. I

Patented Apr. a, rat a,

Application filed May 6, 1913. Serial No. 765,750.

Be it known that I, ROY L. Bonn, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Piston Packing-Rings, ofwhich the following is a specification.

My invention is designed more particuconnection with pistons ofexplosive gas engines, though it will be obvious from a consideration ofthe detailed description anddrawing that it is likewise applicable tomany other forms of pistons and similar constructions where metallicpacking is desired. As is well known to those familiar with explosiveand expansion engines, where a metallic packing ring is 'required, thepiston is circumferentially grooved at one or more points and a splitpacking ring fitted snugly within the groove, with its meeting endssutliciently separated to permit expansion of the ring under heating.The opening, however, provides a path for the gases or fluids from oneside ofthe piston to the other, which steadily increases with wearthereby materially lowering the efiiciency of the engine and ultimatelyre-' .quiring the repairing of the piston, as is well known'to thosefamiliar with this class of machines, Various means have been adopted orsuggested for obviating this difficulty, one of the most common of whichis the use of a plurality of rings in which the splits oropenings arelocated as nearly as may be on opposite sides of the piston;

While this ameliorates the difiiculty to some extent, the constructionpermits the fluids to pass the first ring and by traversing the grooveto the other side of the piston, escape the second ring. It

throughthe opening of or bridge the has also been proposed to join endsof the ring in various ways an ferent devices to prevent the passage offluids through the cut.

My invention belongs 'to this latter class of ring construction and hascertain advantages over those heretofore employed, which witlabeapparent from'the drawmg and detailed description.

While I have illustrated and described the preferred form of my inspecifically vention, I have done so for the purpose of exemplificationonly, for it will be apparent that the invention may be embodied inother forms a for the scope of the inventionreferthe following claims,

, C, forming a rectangular shoulder d by f done in the same same in suchterms as to distinguish it from the pI'lOI art, so far as is known to mewithout, however, relinquishing or abandoning any portion thereof. a

Referring now to the accompanying drawings, Figure 1 is an elevation ofa packing in which I have endeavored to point out the i ring embodyingthepreferred form of my invention; Fig. 2 a fragmentary view on anenlarged scale showing the joint after the r ng has worn considerably;Fig. 3, is a sec-' tion throughthe joint of the ring on the plane of theline 3-3 of Fig. 4 onan enlarged scale; Fig. 4 is a view of the sametaken at right angles to the plane of Figs, 1 and 2; and Fig. 5 is aperspective-showmg the meeting ends of the ring and the bridge or conling device detached. 1 The same 0 aracters of reference muses for thesame parts Wherever they occur in the several views.

The shape of the various parts is best shown in Fig. -5, in which it isseen that the meet ng ends A, A are undercut at B, B andrabbetedfuponopposite sides, as at C, D D which is secant to the outerperiphery of the ring, a tongue E, E being left intermediate theshoulders-uponeach endfof the ring. The piston ring-may be formed in anyof a variety of ways, but preferably by casting a hollow cylinder ofgray .iron or suitable metal which is chucked in a lathe, turned andbored, and the rings out there. from of the necessary width andthickness. The 'rings'are then ground on the sides to finished size,preferably on a magnetic chuck, and split together in circular form,diameter, used to rabbet the opposite corners of the outer faces of theends, forming the rectilinear shoulders D, D referred to above, and theundercutting 'of the tongues will be The ring is then sprung ground tofinished simpleoperations,

the packing ring proper is completed.

and a set of straddle mill cutters,

The bridge piece or coupler is preferably formed of a metal somewhatsofter than that of the ring, as for example, of brass, for areasonwhich will appear later, and where the coupler is small, it may of sheetmetal and struck" up to the required shape. large, however, the formercan be made to, advantage by milling out from a suitably be stamped outIn case the ring and coupler are-1mp setting. By these very. I l

v upon the shoulders D, D

shaped bar. The completed, bridge or coupler comprises the side membersH, H which are curved on their outer edges to conform to the curvatureof the packing ring, and rectilinear on their inner edges, which areadapted to fit within the rabbets formed upon the ends of the ring andseat thereof. A tiebar or cross-piece J connecting the members H, Hextends beyond the plane of the rear edges of the side members, and whenthe bridge is in operative position, occupies the cross channel formedby the undercutting of the ends of the ring at B, B, as above described.

The ring is assembled with the piston in much the usual manner, thebridge piece, however, being adjustedto the ends of the ring after it isslipped into the groove protlons required,

vided for it in the piston. It will be seen that with a ring constructedaccording to my invention, leakage directly past the opening or aroundthe back of the ring is prevented, and the bridge is maintained inproper contact with the wall of the cylinder by the pressure of the ringends, and is therefore independent'o-f the gas pressure within thecylinder. As the ring wears, the coupler is fed outward against thecylinder wall he resilience of thering, the shoulders on theends of.which act against the side members of the coupler, as seen in Fig. 2

of the drawing and as the ring opens by ,wear the coupler, being ofsofter material, is forced to wear and maintains the fit against thewall of the cylinder. On the other hand, the tie-bar passing behind thereduced ends of the tongues, prevents the coupler being forced out bythe pressure and thereby wearing faster than the ringQitself.Furthermore, the tongues of the ring are always protected by the couplerand the walls of the piston groove, and therefore the danger of breakingthem off is avoided.

-By reason of the simplicity ofthe construction and thenature of the fewoperapiston rings may be made according to my invention at a low cost ofmanufacture and used much longer than heretofore, before renewal isrequired.

I claimz' l. A split packing ring for pistons and the like, having theends thereof rabbeted on their convex faces to form shoulders, a couplercomprising a member fitting upon the shoulders and a portion extendingunder the ends of the ring whereby both outward and inward movement ofthe bridge piece relative to the ring ends is limited.

2. A split packing ring for pistons and the like, the meeting ends awayto form shoulders on the same plane secant to the outer circumference ofthe ring, and a coupling having members with straight inner edgesadapted and arranged to overlie said shoulders, and a portion extendingbeneath the meeting ends of the ring.

3. A. split packing ring for pistons and the like, having the oppositeed es of the convex faces of its ends rabbeted to form longitudinalshoulders, a coupler comprising a pair of longitudinal meinbers fittingupon said shoulders, and a cross-member extending beneath the ends andsecuringthe longitudinal members together.

4. A split packing ring for pistons and the like, the ends of which arerabbeted on their exterior edges to form shoulders cut away interiorly,tudinal members adapted to rest upon said shoulders, and a cross-memberconnecting the same and adapted to underlie the cutaway portion of theends.

- 5. A split packing ring for pistons and the like, having its outeredges rabbeted to form longitudinal shoulders in a common plane secantto the outer circumference of the ring and under-cut to form atransverse groove or passage formed partly in each end of the ring, anda coupler comprising a pair of longitudinally extending members adaptedto-fit within said rabbets, and a transverse member adapted to extendbeneath the ends of the ring within said groove.

ROY L. BURD.

lVitnesses JOHN B. MA AULEY, ROBERT DOBBERMAN.

of which are out.

a coupler having longi-'

